Spray-gun



W. A. HE}NRICH.

SPRAY GUN.

APPLlCATlON FILED JUNE l. |920.

1 ,382,64 1 A. Patented June 28, 1921.

2 SHEETS-SHEET 2- UNITED sTATEs PATENT OFFICE.

WALTER A.. HEINRICH, Ol' ST. LOUIS, MISSOURI, .ASSIGNOR T0 W. N. MATTHEWS AND BBOTm, INO., OF ST. LOUIS, MISSOURI, A CORPORATION OF NEW MEXICO.

SPRAY-GUN.

Specification of Letters Patent.

Patented June 28, 1921.

Application led June 1, 1920. Serial No. 385,653.

l others skilled in the art to which it appertains to make and use the same, reference being had to the accompanyin drawings, forming part of this spec catlon, 1n Which,-

Figure 1 is a side elevational view of my Spray sun;

Fig. 2 is a vertical sectional view through the same.

Fig. 2a shows a solid nozzle employed for producing a circular pattern.

Fig. 3 1s a top plan view.

Fig. 4 is a front elevational view.

Fig. 5 is an enlarged view of the nozzle and nipple arranged in the front end of the barrel.

Fig. 6 is a detail view of the manner of securing the s rings to the valves.

This invention relates to a new and useful improvement in spray guns for palnt or other liquids or'powders, the object being' to provide a simple, cheap construction which will deliver a round or fan-shaped pattern onto the surface to be covered.

In the construction shown in the acoompanying drawings, the liquid or powder to be sprayed passes through a nipple havlng a constricted delivery opening and screwed into the front end of the barrel while the air or gas passes around the nipple and is delivered around the nipple at angles which produce and form a spray having a circular pattern. If the nozzle is provlded wlth an gularly disposed openings through whlch air will pa, the point of intersection of the air passing through these openings being in front of the nipple, the atomized spray will be flattened out to assume a fanshape. By adjusting the nozzle so that these flattened air blasts are one above the other, the fan-shaped pattern will be horizontal, whereas a quarter turn locating the angularly-disposed air-blast openings in a horlzontal plane will produce a vertical sheet of fan-shaped pattern. These angularlydisposed blast openings are shown 1n Figs. 2, 4. and 5, while in Fig. 2, I have shown a solid form of nozzle, the latter produclng a circular pattern. These nozzles are preferablly interchangeable on the same gun.

n the drawings, 1 indicates a casting having a reduced portion at the junction of the barrel and handle, in which reduced portion is an opening 2 by which the gun may be hung upon a nail or other support when not 1n use. 3 is a handle which may be of any suitable material, said handle being formed with a longitudinally disposed opening through which passes a tube 4 screwed into the casting 1 and communicating with a conduit or passage 5 in the casting. 6 is a washer seated against a shoulder in the lower end of the handle and against which washer impinges a nut 7 whereby the handle is held in position, said nut 7 having a threaded extension 8 forming a nip le for the attachment of a flexible tube eading from some suitable source of compressed air, or other gas, supply.

The casting 1 is provided with a downward extension 1a having a fiat rear face to coperate with a tapered iiat face formed on the handle, whereby when the nut 7 is screwed home, the handle is held firmly in position, the ilat coperating faces just referred to preventing the handle from turning. This extension 1l is also provided with a trigger guard 1b which not only serves to protect the trigger but affords a rest or support for the operators linger in manipulating the gun.

The trigger 10 is bifurcated at its u per end and pivoted at 11 on each side o the casting 1, the prongs of the bifurcation having forwardly extending members 11 which are pivotally connected to the legs 12 preferably guided in grooves in the side Walls of the casting 1, and the pivotal connection between the arms 11a and the legs 12 possesses suicient lost motion or play, as for instance, a longitudinally disposed slot in the arms 11, indicated by dotted lines in Fig. 1, may be provided so as to enable the parts to articulate without binding.

The saddle 12 extends across the barrel of the gun, as shown in Figs. 3 and 4, and is normally held upwardly by means of a plunger 13 arranged on the upper end of the stem of a valve 14, which valve co crates' with a seat in a threaded valve p ug 15 screwed into the casting 1. The valve and plunger are -held upwardly by means of a spring 16 and in order that the spring may be withdrawn when it is desired to clean the parts and the saddle is removed and the valve plug 15 backed out, the upper convolution of spring 16 is squeezed in and around the flaring projection extending from the bottom face of valve 14.

The air passage or conduit 5 before reerred to opens into' the lower end of the bore in casting 1 which receives the spring 16, and when the valve 14 is unseated by being depressed, the air will pass upwardly through and around the spring beyond the valve, through ported openings 15d 1n the valve plug and into the conduit 5a communicating therewith and leading to the chamber formed by the nozzle 17 having threaded connection with the barrel of the gun whereby it may be rotatably adjusted. This nozzle has two straight openlngs 17a drilled or bored therethrough, said openings being diametrically opposite each other and arranged at an angle so that the blasts of air issuing therefrom will have their point of intersection immediately in front of the constricted opening in the nipple 18 through which the liquid to be sprayed passes. By this construction, it will be noted that the air passing around the cylindrical portion of the constricted mouth of the nipple 18 will form a cylindrical target if a solid imperforate nozzle, such as shown in Fig. 2, is employed, and by Aadjusting the nozzle 17 inwardly and outwardly the size of the pattern at a given distance from the surface to, be sprayed can be regulated.

If the form of nozzleshown in Figs. 2, 4 and 5 is employed, z'. e., where there are diagonally disposed openings through which issue jets, or blasts, of air whose point of intersection is located in advance of the mouth of the nipple 18, it will be obvious that these jets of air will flatten out the cylindrical pattern and produce a anlike pattern which may be vertical, if the openings are in horizontal plane, or horizontally disposed if the openings 17a are in a vertical line.

A flexible pipe (not shown) is connected to a threaded hollow nipple 20 screwed into the casting 1 and preferably between the barrel and the trigger. This nipple has a threaded ring 21 screwed into its lower end which forms a seat or bearing for spring 22 which spring holds a valve 23 up to its seat. which seat is formed at the upper end of the nipple plug 20 and opens into a conduit or passage 24 leading to the centrally arranged ni ple 18 whereby a central flow of the liquid) to be sprayed is thus attained.

25 indlcates a bushing having a beveled tight joint at its lower end, said bushing being mounted in a plug 26 screwed into the casting 1.

27 is a plunger secured to the valve stem to the nipple 20. The operator now holds the trigger, first opening the air valve and admitting air around the end of nipple 18 and -by a continued pull on the trigger, the valve 23 is opened so as to admit a supply of fluid through the nipple 18. If the solid nozzle 17, shown in Fig. 2a, is employed, a cylindrical pattern of the spray will be made; but if the nozzle provided with openings 17a, as shown in Figs. 2, 4 and 5, is employed the spray pattern lwill be fanshaped either horizontally or vertically disposed, depending upon the adjustment of the nozzle 17.

The purpose of sequentially operating i lirst the air valve and then the liquid valve is to insure the flow of air before the admission of liquid to the nipple 18 and following the shutting off of the supply of liquid to said nipple 18, In this manner, a solid stream of liquid which might flow from the gun, if the valves were simultaneously opened or if the liquid controlling valve was opened slightly in advance of the air valve, is avoided, and likewise when the trigger is released, the nippler18 will be practically cleared of liquid at or near its mouth so that there is little liability of the li uid leaking therefrom.

hat I claim is A spray gun comprising the combination of a casting formed with conduits or passages for compressed air or gas and a, liquid or powder, valves in control of said passages, means for operating said valves, a nipple for supplying a central flow of liquid or powder, and an adjustable nozzle around said nipple for projecting a blast of air or gas around the forward end or mouth of said nipple, said nozzle being WALTER A. HEINRICH. 

